need diagnosis

One of my Australorps, Molly, recently had bumble foot. We thought we had cured it, but turns out it hadnt fully healed and she also had it on her other foot. We have now successfully removed the core. I dont know if it's related, but she stopped laying awhile ago even though she's about 2 yrs...

We've lost two hens (Constance and Louisa) a week apart from what seems to be the same ailment. I'm trying to figure out what the cause might be. I would appreciate any ideas or guidance here so I don't lose any more birds. 1) What type of bird , age and weight (does the chicken seem or feel...